Open Source Developer Tools
Discover 447 open source Developer Tools repositories from GitHub, each with an analysis of what it does, key features, use cases and alternatives. Developer Tools projects here are most often combined with Python, AI Agents and CLI. Last updated October 4, 2026.
447 repositories · updated October 4, 2026
rio: Build Web Apps in Python
Rio is a Python framework for building interactive web apps and local GUI applications with component-based interfaces. It suits Python developers who want to create polished interfaces without writing HTML, CSS, or JavaScript.
obfuscator-io-deobfuscator: Make Obfuscated JavaScript Easier to Read
A TypeScript tool that reverses several common transformations used by Obfuscator.io, making scripts easier to inspect. Use it from a browser or CLI when analyzing code, with processing designed not to execute the input script.
osaurus: Find the Project's Current Repository
This repository is a migration notice for Osaurus, not the active project home. Development, issues, and releases have moved to osaurus-ai/osaurus, where visitors can find current project information.
tunn: Manage SSH Tunnels from a YAML Config
tunn launches and monitors SSH port forwards from a single YAML configuration, using your existing OpenSSH setup. It suits developers who need a simple way to run selected tunnels together or manage them in the background.
redoc: Generate API Documentation from OpenAPI
Redoc turns OpenAPI definitions into responsive, navigable API reference pages. It suits API teams that want to publish documentation as a static HTML file or integrate a reference into a web application.
stagewise: Build and Orchestrate Coding Agents in an IDE
stagewise is an agentic IDE that combines a browser preview, coding agent, and codebase editing workflows. It suits developers who want to inspect and change web apps without switching tools, using their own model provider or a stagewise account.
inspector: Test and Debug MCP Servers and Apps
MCPJam Inspector helps developers test, inspect, and evaluate MCP servers and apps across clients and models. Use it to debug protocol and OAuth behavior, run repeatable evaluations, and check for regressions in CI.
mcpo: Turn MCP Tools into OpenAPI Services
mcpo proxies MCP servers as standard HTTP APIs with generated OpenAPI schemas and interactive docs. It is useful when agents, apps, or teams need to use MCP tools through familiar REST interfaces.
nerd-fonts: Add Developer Icons to Programming Fonts
Nerd Fonts patches programming fonts with icon glyphs used by terminals, editors, and status lines. Install a ready-made patched font or use its FontForge-based patcher to customize a font.
langcorn: Serve LangChain Apps as FastAPI APIs
LangCorn turns LangChain chains, agents, and custom run functions into FastAPI endpoints. It suits developers who want to expose existing language-model workflows through a documented REST API with optional token authentication.
mkcertWeb: Manage Local Development Certificates in a Web UI
mkcertWeb is a self-hosted web interface for generating and managing locally trusted development certificates with mkcert. It suits developers and small teams that want browser-based certificate workflows, device enrollment, and optional authentication or expiry alerts.
awesome-crawler: Find Web Crawling Tools Across Languages
awesome-crawler is a curated directory of web crawlers, spiders, scraping libraries, and related resources across many programming languages. Use it to compare starting points for a project rather than as a crawler implementation itself.